Player 1 gun would fire but nothing would register on the screen. The issue followed the port so I started testing around for continuity. When testing these two pins on the player 1 port it had continuity which seemed odd since player 2 port did not.
When looking at the pin out they should NOT have continuity so I traced the pins to this chip located at U119:
The bottom left pin is the ground pin and after probing around I found the optical pin was grounded when it was not supposed to be. I ordered a 74F320 chip and after replacing it the gun worked correctly.
